Centrifugal pipe-casting machine and mold



J. H. UHRIG CENTRIFUGAL PIPE CASTING MACHINE AND MOLD Filed Nov. 23,1926 2 Sheets-Sheet 1 Dec. is, 1928.

J. H. UHRIG v CENTRIFUGAL PIPE CASTING MACHINE AND MOLD 2 Sheets-Sheet 2Filed Nov. '23, 1926' Patented Dec. 18, 1928.

; UNITED STATES PATENT OFFICE.-

J'OHN H. UHRIG', OF BEVERLY, NEW JERSEY,-AS SIGNOR TO UNITED STATES CASTIRON PIPE & FOUNDRYCOMPANY, OF BURLINGTON, NEW JERSEY, A CORPORATION OFNEW J ERSEY.

-- cnn'rnmoeen Hrn-oAs'rIne MACHINE AND mom.

Application filed November avoiding the tendency; of the mold to movelongitudinally. By preference, I employ a steel mold, the outer wall ofwhich conforms substantially to the inner conformation of the moldandwhich is formed without the usual radially extending flanges at theend of the mold, though this feature of myconstruction forms the subjectmatter of a sep a,

rate application, filed November 6, 1926, Serial Number 146,612. Bypreference also I employ in my construction, as 'a means forrotating themold, a driving ring loosely,

connected to the end of the mold and independently supported, a featurewhich forms the subject matter of my co-pending application, filed'November 23, 1926', Serial Number' 150,207.

The nature ,of my present invention will be best understood asdescribedin connection with the drawings, in which Figure 1 is a'longitudinalsection on the angling lines 11 of Fig. 2, and a Figure 2 is a crosssection on the line 2--.2 of Fig. 1. I

A indicates the mold, having a bell end A and a spigot end A. A.indicates the butt end of the bell of the mold, which is formed with apacking groove, indicated at a and isinteriorly formed to provide acore-seat, as indicated at A. A A indicate notches formed in the coreseat extension of the mold end, in which also are formed key seats,indicated at A, for the use of keys employed as, 1e2s. 'Serial no.150,208.

ancl'F indicate respectively the lower and upper sections of the casing,in which the mold revolves supported on rollers, indicated at O, 0.. G,G are outer and inner end walls over which the drum B extends and withwhich, by means of' packing rings, indicated at 9, it forms a watertight joint. H indicates an end wall at the other en of .the waterjacket casing, wit-l1 which, and a part to be described, packing ringsh, h form water tight joints. I indicates an end wall at the right handend of the casing, which is formed with an inwardly extending flange 1hJ, J are shafts supported on the walls H wheel K a shouldel' K and anoutwardly.

extending flange K extending around the buttend A of the bell end of themold, with which, by means of the packing k it 'forms a water tightjoint. The driving ring is also formed with a downwardly extendingflange K, which abuts against the thrust ringvL, which rests in turnagainst the in-v side of the flange P. N is a ring secured to the end ofthe ring K by bolts, indicated at- N and formed with inwardly projectingdogs M which extend into the radial notches A in the end of the .mold.The ring has also an extension M which rests against the outside of theflange I P is a gear wheel engaged with the gear K and by means of whichthe ring and mold are rotated.

The essential feature of my invention is to provide means whereby themold in its 'as-' sembly with the-water jacketed casing will be soconstructed that the pressure of the water in the casing will be exertedequally in both directions along the mold, so as to avoid any tendencyto movethe mold 1on-' gitudinally. In the construction illustrated, itis obvious that the diameter of the butt end to hold the core inposition. B indicates a A of the mold and the diameter ofthe drum flangesecured to the spigot end of-the mold b screws indicated at C and havinga drumli (e extension B in which are formed packing-ring seats,-indicated at 6 The diameter of the drum B is, as shown, the same asthe outer diameter of the but-tend A of the mold. D indicates an endringwhich is secured to the flange B- by screws E, as indicated, or in anyother convenient way. F

' B being the same, the pressure of the water will be equal at both endsof the mold and there will be no tendency to shift themoldlongitudinally.

Q It will be obvious that my invention is calpable of many modificationsin form and, except where specifically limited in the claims, I do notwish to be understood as confining myself to the specific. constructionillustrated, 1

although it is, I believe, the best form for the utilization ofmyinvention, especially in that it permits of the use of a drum B ofminimum diameter.

Having now described my invention, What I claim as new and desire tosecure by Letters Patent is:

1. In a centrifugal pipe casting machine a casing forming a water jacketsurrounding the mold, in combination with abell ended pipe moldrevolvably supported 1n the casing, and means connected to the bell andspigot ends of the mold forming Water tight joints of equal diameter forthe Water jacket and so as to balance the Water pressure and avoid endthrust on the'mold. v

2. In a centrifugal pipe casting machine a casing forming a Water jacketsurrounding the mold, in combination with a bell ended pipe moldrevolvably supported in .the casing,

a packing ring fitted to the bell end of the mold forming a Water tightjoint for the water jacket, a joint forming drum secured to the spigotend of the mold having substantially the same diameter as the part ofthe bell end to which the, packing ring is fitted and a packing ring orrings fitted between said drumv and the end wall of the Water jacket.

3. A centrifugal metallic pipe mold, the outer Wall of Which conformssubstantially to its inner wall and formed Without integral radiallyextending flanges, said mold having means for forming a Water tightjoint at its bell end and a separable joint forming drum at its spigotend of substantially the sanlie diameter as the joint formed at its bellen I JOHN H. UHRIG.

